Hampshire · England
New Build Mastic in Welborne
We cover Welborne for plot mastic for developers and snagging failed sealant in new homes. Old sealant removed completely, joints prepared properly.
- Leaking shower tray seals in a new home
- Untidy sealant flagged on a snagging list
- Kitchen sealant that has pulled off the wall
Should I try it myself first?
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so just mention it when you contact us.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
New build mastic for homes and businesses in Welborne
A new house keeps drying out and settling for its first couple of years. Timber shrinks, plaster dries and baths and trays bed down, and sealant applied in a hurry at handover can split. If you are dealing with frame joints opening as the plaster dries and messy sealant that spoils new finishes, we can put it right, on kitchens, skirting & floors and windows & doors alike.
In a village or hamlet like Welborne, new homes are more likely to be a barn conversion or a handful of houses than a big estate. Each still needs its sealant and floor joints finished properly.
You are covered for a year from the day we finish. If anything is not right with it, ring 0345 464 0079 or send us an email.
- Place
- Welborne (PO17)
- Wider area
- Hampshire
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Nearby places to Welborne
Also in Welborne
Welborne: your questions answered
Is Welborne in your area for new build mastic?
Yes. We work across London and the South East, and Welborne is part of that. Just call 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear quote.
Do you cover smaller places like Welborne?
Yes. Welborne is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Why does sealant fail so quickly in new builds?
A new house dries and settles for a year or two, and sealant is often applied quickly onto dusty surfaces. Both lead to early failure.
Will the old sealant be removed?
Always. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
How long should I leave it?
Cure times vary by product. Before we leave, we’ll tell you the cure time.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Welborne and the rest of Hampshire.
Do you work through snagging lists?
Yes. Snagging lists are a common starting point for us. We agree the sealant items with you before work begins.
Who should fix failed sealant in a new build?
Start with your builder while their snagging or warranty period runs. After that, or if their repair keeps failing, we can do it.
What we are called out for in Welborne
Sealant applied onto damp surfaces doesn’t bond well. On a busy site, joints aren’t always given time to dry first.
Any of these means the joints need attention:
- Untidy sealant flagged on a snagging list
- Skirting joints opening in the first winter
- Cracks appearing as a new home settles
- Gaps behind new kitchen upstands
In and around Welborne, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
What to look for in a quote
- How long the guarantee is
- Whether they seal over old material or remove it
- Which sealant they’ll use, and why
- Who turns up on the day
New build mastic in Welborne: local notes
Welborne is close to the coast. New homes near the sea put their outside mastic to work from day one, so it’s worth checking at snagging. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you’ve bought a new home near Fareham station, the sealant around baths, showers and frames is worth checking in the first year or two.
Welborne is about 2 miles north of Fareham, in Hampshire. Jobs in Welborne get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Welborne is one of 683 towns and villages in Hampshire we cover. Our Portsmouth page covers work nearby (7 miles or so).
Every address in PO17 is within our area for new build mastic. Nearby, we also carry out new build mastic in Crockerhill (1 mile east), Wickham Common (1 mile north-east), North Fareham (1 mile south-east), Hundred Acres (2 miles north-east) and Fareham (2 miles south). Further out, we also cover Winchester (13 miles north-west), Gosport (6 miles south), Havant (9 miles east), Eastleigh (9 miles north-west), Horndean (8 miles east) and Totton (14 miles west).
Local landmarks in Welborne
Locally, jobs take us to homes and businesses close to The Miners Arms. The closest station to Welborne is Fareham station, about 1.9 miles south of the centre. Well-known places in the area include Carron Row Farm Museum (2.4 miles south-west) and Portchester Castle (4.5 miles south-east). The countryside around Welborne includes Portsdown Hill and Swanwick Lakes.
What the job involves on each surface
Kitchens
Sink joints are wet all the time. We use a sealant suited to kitchens suited to the job.
Show homes
We seal show-home bathrooms, kitchens and frames to a tidy standard. We will plan around viewing times.
Landlord and commercial work in Welborne
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will give you a quote.
For anyone letting property in or around Welborne, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.
Why deal with it now?
Resealing everything on a snagging list in one visit is usually simpler than chasing joints one at a time. It’s one visit, one quote and one set of cure times to plan around. Older cottages and farmhouses around Welborne can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs. Ask us for a quote and we will go through it with you.
Why Welborne customers choose us
- Arbo and Everbuild products
- More than 20 years in sealant work
- Homes, businesses and hotels
- White, clear, grey or another colour, product permitting
Take a look at how sealant jobs are priced and our reviews.
How it works
There’s no need to move everything out before we come, only the area right around the joints. We protect the rest, and the work takes a few hours in a single home for a typical job. In a small place like Welborne, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- Each joint is checked for movement before any work starts.
- We remove the failed sealant and clean the joints.
- We make sure the joints are dry and prime them if needed.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- We check every joint and leave you with the cure times.
Preparing for the visit
- Tell us if parking is tricky
- Try not to wet indoor joints just before the visit
- Tell us about access, such as stairs, a lift or high-level joints
How to get a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved before giving you a price.
Related advice
Quotes for new build mastic in Welborne
Jobs vary more than people expect. What affects the quote:
- The product the joint needs
- Whether the work is at height
- The size of the job
- Whether there’s mould to deal with
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Helping us quote
When you call or email, these details help:
- The address or postcode of the job
- What’s wrong with the joints now
- Whether it has been sealed before
- How many joints, rooms or windows are involved
We don’t publish a price list, because every job is different. Instead, your job gets its own clear quote. To get started, phone 0345 464 0079 or email us.